HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

Define temperature coefficient of resistance.

Write a short note on superconductors?

Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.

Explain the equivalent resistance of a series resistor network.

Explain the equivalent resistance of a parallel resistor network.

The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.

An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω, and 92 Ω resistors available. How can she connect the available resistors to get the desired value of resistance?

Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate

1. the current drawn from the cell
2. current through each resistor

A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly

A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current 1 = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the center of the spiral is

Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?

Define magnetic dipole moment.

State Coulomb’s inverse law.

Calculate the magnetic field at a point on the axial line of a bar magnet.

Obtain the magnetic induction at a point on the equatorial line of a bar magnet. Magnetic field at a point along the equatorial line due to a magnetic dipole (bar magnet).

How is Eddy current produced? How do they flow in a conductor?

Give the uses of Foucault current.

Explain the types of emission spectrum.

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, λ = 500 nm]

State the laws of reflection.